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• ffmpeg h264 interesting bright video fail ?

  23 novembre 2019, par Max Paython

  I am trying streaming with ffmpeg using the information I found here.

  • Server

    ffmpeg -f dshow -i video="john":audio="doe" -vcodec libx264
    
    -preset ultrafast -tune zerolatency -acodec aac -f mpegts udp://localhost:1234

  • Client

    ffmpeg -i udp://localhost:1234?listen test.mp4

  The client will actually live stream the video, but for testing purposes I am writing the output to a file for now.

  Here comes the interesting part. I began the stream(video and audio) in a dark room, everything is fine. I turn on the room’s lights and the client cries with many errors. I later checked the output, it is very corrupted indeed on the light turned-on parts. What could be the reason behind this ? I am posting the errors here if it could be of assistance.

  Some of the errors :

  udp://localhost:1234?listen: corrupt decoded frame in stream 0trate= 845.6kbits/s dup=1250 drop=0 speed=1.08x
  
      Last message repeated 1 times
  
  [h264 @ 0000026c4af69400] Invalid NAL unit 1, skipping.7.61 bitrate= 864.7kbits/s dup=1441 drop=0 speed=1.07x
  
  [h264 @ 0000026c4af69400] Invalid level prefix
  
  [h264 @ 0000026c4af69400] error while decoding MB 18 8
  
  [h264 @ 0000026c4af69400] concealing 911 DC, 911 AC, 911 MV errors in P frame
  
  [h264 @ 0000026c4af4b780] Invalid NAL unit 1, skipping.
  
  [h264 @ 0000026c4af4b780] negative number of zero coeffs at 10 14
  
  [h264 @ 0000026c4af4b780] error while decoding MB 10 14
  
  [h264 @ 0000026c4af4b780] concealing 679 DC, 679 AC, 679 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0
  
      Last message repeated 1 times
  
  [h264 @ 0000026c4ba1e1c0] Invalid NAL unit 1, skipping.8.21 bitrate= 858.0kbits/s dup=1460 drop=0 speed=1.07x
  
  [h264 @ 0000026c4ba1e1c0] out of range intra chroma pred mode
  
  [h264 @ 0000026c4ba1e1c0] error while decoding MB 34 18
  
  [h264 @ 0000026c4ba1e1c0] concealing 495 DC, 495 AC, 495 MV errors in P frame
  
  [h264 @ 0000026c4bb16840] top block unavailable for requested intra mode
  
  [h264 @ 0000026c4bb16840] error while decoding MB 10 0
  
  [h264 @ 0000026c4bb16840] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0
  
  [h264 @ 0000026c4bb16cc0] Invalid NAL unit 0, skipping.8.58 bitrate= 853.9kbits/s dup=1463 drop=0 speed=1.06x
  
  [h264 @ 0000026c4bb16cc0] corrupted macroblock 16 28 (total_coeff=-1)
  
  [h264 @ 0000026c4bb16cc0] error while decoding MB 16 28
  
  [h264 @ 0000026c4bb16cc0] concealing 113 DC, 113 AC, 113 MV errors in P frame
  
  [h264 @ 0000026c4bb17140] cbp too large (84) at 12 0
  
  [h264 @ 0000026c4bb17140] error while decoding MB 12 0
  
  [h264 @ 0000026c4bb17140] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  [mpegts @ 0000026c4aeb8d80] PES packet size mismatch

  Edit : As suggestion, I added these parameters to the server.

  -b:v 1M -bufsize 2M

  Now the errors are mostly gone. Except one time where it seemed like it occured just as I was turning off the lights, although I could not reproduce it after trying 4-5 times.

  Errors :

  [h264 @ 000002646f0d2f80] cbp too large (118) at 23 1422.25 bitrate= 659.5kbits/s dup=368 drop=0 speed=1.33x
  
  [h264 @ 000002646f0d2f80] error while decoding MB 23 14
  
  [mpegts @ 000002646e578d80] PES packet size mismatch
  
  [h264 @ 000002646f0d2f80] concealing 666 DC, 666 AC, 666 MV errors in P frame
  
  [h264 @ 000002646f0d0f80] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  [aac @ 000002646e64d640] Number of bands (59) exceeds limit (43).
  
  Error while decoding stream #0:1: Invalid data found when processing input
  
  [aac @ 000002646e64d640] Multiple frames in a packet.
  
  [aac @ 000002646e64d640] Reserved bit set.
  
  [aac @ 000002646e64d640] Number of bands (31) exceeds limit (29).
  
  Error while decoding stream #0:1: Invalid data found when processing input
  
  [h264 @ 000002646e5e11c0] concealing 160 DC, 160 AC, 160 MV errors in P frame
  
  udp://localhost:1234?listen: corrupt decoded frame in stream 0trate= 633.1kbits/s dup=368 drop=0 speed=1.35x
  
      Last message repeated 2 times

  The errors decreased because I increased the bitrate ? (I don’t know the default bitrate by the way). Bright decoding fails because it carries more information, data ? (same in raw video, but maybe file is heavier encoded bright frames)

• How to use libvlc for low-frame-rate rtsp stream decoding

  11 mai 2017, par user1547688

  I am using libvlc for RTSP h.264 bitstream decoding and display in PC. For the best experience (i.e. low latency), I uses the following options

  :file-caching=0
  
  :tcp-caching=0
  
  :rtsp-caching=0
  
  :network-caching=0
  
  :clock-jitter=0
  
  :avcodec-fast

  With these parameters, the latency is acceptable in comparison to the open-source project "ONVIF device manager"(ODM) where FFMPEG is used for decoding.

  When RTSP server deliver low frame-rate RTSP stream, (1 frame/second). These configuration will freeze after displaying a few frames (3-5 frames).

  I have tried 2 different approaches

  1. Disable synchronization by

     :clock-synchro=0

  This will enable the decoding process to go on, however, an accumulated period of time lagging could be observed.

  2. Use network-cache

  My experiments shows that

  :network-caching=1200

  Will make decoding go smoothly, however, the latency is over 1-2 second in comparison to ODM.

  Is there a way to handle the low frame rate issue in libvlc without providing such big latency ?

• Run "scrcpy" Commands And Throws Error "libopenh264.so.7 is missing" / "openh264 disabled"

  7 mai 2024, par 息子運命

  I try to run scrcpy command like what I did before, and proved if it's worked not just once.

  


  scrcpy -m 540 -S


  


  but after re-installing my OS and use Fedora OS with dnf package manager, I got errors with output below.

  


  WARN: Demuxer 'audio': stream explicitly disabled by the device
WARN: [FFmpeg] libopenh264.so.7: cannot open shared object file: No such file or directory: libopenh264.so.7 is missing, openh264 support will be disabled
ERROR: Demuxer 'video': could not open codec
ERROR: Demuxer error
[server] INFO: Device screen turned off


  


  Seems I got a problem here because [FFmpeg] libopenh264.so.7 is missing and it cause openh264 support disabled.